期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 40, 页码 13155-13158出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08373
关键词
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资金
- Physical Chemistry of Inorganic Nanostructures Program [KC3103]
- Office of Basic Energy Sciences of the United States Department of Energy [DE-AC02-05CH11231]
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- Suzhou Industrial Park
- LAM Research Fellowship
Highly uniform single crystal ultrathin CsPbBr3 nanowires (NWs) with diameter of 2.2 +/- 0.2 nm and length up to several microns were successfully synthesized and purified using a catalyst-free colloidal synthesis method followed by a stepwise purification strategy. The NWs have bright photoluminescence (PL) with a photoluminescence quantum yield (PLQY) of about 30% after surface treatment. Large blue-shifted UV-vis absorption and PL spectra have been observed due to strong two-dimensional quantum confinement effects. A small angle X-ray scattering (SAXS) pattern shows the periodic packing of the ultrathin NWs along the radial direction, demonstrates the narrow radial distribution of the wires, and emphasizes the deep intercalation of the surfactants. Despite the extreme aspect ratios of the ultrathin NWs, their composition and the resulting optical properties can be readily tuned by an anion-exchange reaction with good morphology preservation. These bright ultrathin NWs may be used as a model system to study strong quantum confinement effects in a one-dimensional halide perovskite system.
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